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Chain Microstructure, Crystallization, and Morphology of Olefinic Blocky Copolymers
Author(s) -
Tong ZaiZai,
Huang Jie,
Zhou Bing,
Xu JunTing,
Fan ZhiQiang
Publication year - 2013
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.201200615
Subject(s) - crystallinity , crystallization , small angle x ray scattering , copolymer , materials science , amorphous solid , microstructure , morphology (biology) , crystallography , polymer chemistry , scattering , lamellar structure , chemical engineering , polymer , chemistry , composite material , optics , physics , geology , engineering , paleontology
The chain microstructure, crystallization, and morphology of three olefinic blocky copolymers (OBCs) are compared. The weight percentage of the hard block and the octene content in it are calculated from the 13 C NMR spectra with a two‐site first‐order Markovian model. The lengths of the hard blocks are compared from the melting and crystallization behaviors. The remarkable difference between the crystallinity measured by DSC, and wide‐angle X‐ray diffraction (WAXD) indicates the presence of partially ordered phases. Small angle X‐ray scattering (SAXS) shows that the partially ordered phases in OBC‐A are mainly located at the interface between the crystalline and amorphous phases, but exist as separated microdomains in OBC‐B. As the hard block becomes shorter, there are also more, separated partially ordered phases in OBC‐C. Spherulites are observed in all OBCs by POM and the size of the spherulites decreases in the order: OBC‐A > OBC‐B > OBC‐C. TEM shows that spherulites are poorly developed in a thin film of OBC‐B.